Great! It's essential to your frogs growth, actually.
As for the dust washing off, that's a tough one. I have the same problem with my bullfrogs crickets. Since the fruitflies are so small, that's going to be tough. Do you have a large land area to place them on? If you were using pinhead crickets it probably would be easier and less likely for the dust to wash off. You can also buy fake Waterlilies and place the fruit flies on those. I place my crickets on those and fake water reeds. Only problem is when Gnag flips the Waterlilies onto the other side (she's easily strong enough to do that now.)
From my experience, all bullfrogs make noise, the females just less than the males. The best time to actually tell the gender is during the breeding season. If the typanum/eardrum is larger than the eye and the throat is yellow, it's a male. I'm actually attempting to discern whether Gnag is a male or female, it's difficult because Gnag's got the features of a male in terms of size, but sometimes his/her throat is white, whilst at night it is yellow-green.
I don't expect your little one will make any noise until she's a yearling, though. For now, she'll probably only make a loud "PEEP!" when frightened, and sometimes bark.
Oh, how I came with Gnag? I didn't actually come up with it, Gnag the Nameless is the name of the main antagonist from one of my favorite book series when I was younger, The Wingfeather Saga. But, in the books Gnag is pronounced "Nagg" whilst I pronounce my Gnag's name as "Guh-Nagg". As for my other amphibians, Thermidor is the Month of Summer Heat in the French Revolutionary Calendar. Gargan and Urtham I came up with on my own. Bumpy Digtoad is also from the Wingfeather Saga. My friend named Levi, because he's his frog. I'm taking care of him because he can't keep Levi at his house due to the loud croaking he produces. If I ever get another amphibian, I may name it Scidolius ("Sidd-o-lee-us") or Tyrizen (T-I-reh-zen), both names I came up with on my own.



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